linux-kernel - RE: [RFC PATCH v3 1/5] dt: add of_get_child

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Date:	Wed, 21 Dec 2011 03:18:19 +0000
From:	Dong Aisheng-B29396 <B29396@...escale.com>
To:	Stephen Warren <swarren@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"linus.walleij@...ricsson.com" <linus.walleij@...ricsson.com>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"cjb@...top.org" <cjb@...top.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: RE: [RFC PATCH v3 1/5] dt: add of_get_child_count helper function

> -----Original Message-----
> From: Stephen Warren [mailto:swarren@...dia.com]
> Sent: Wednesday, December 21, 2011 7:59 AM
> To: Dong Aisheng-B29396; linux-kernel@...r.kernel.org
> Cc: linus.walleij@...ricsson.com; s.hauer@...gutronix.de;
> rob.herring@...xeda.com; linux-arm-kernel@...ts.infradead.org;
> kernel@...gutronix.de; cjb@...top.org; devicetree-discuss@...ts.ozlabs.org
> Subject: RE: [RFC PATCH v3 1/5] dt: add of_get_child_count helper function
> Importance: High
> 
> Dong Aisheng wrote at Tuesday, December 20, 2011 10:41 AM:
> > From: Dong Aisheng <dong.aisheng@...aro.org>
> >
> > Currently most code to get child count in kernel are almost same, add
> > a helper to implement this function for dt to use.
> 
> > diff --git a/include/linux/of.h b/include/linux/of.h
> 
> > +static inline int of_get_child_count(const struct device_node *np) {
> > +	return -ENOSYS;
> > +}
> 
> Wouldn't it be better to return 0 here? -ENOSYS would be fine if the function
> returned an error code, but it's really returning a count, and other "dummy"
> functions that return data return 0/NULL already. This would also allow you to
> just use the value directly in all cases rather than having to check for a < 0
> error case.
> 
Good point.
Will update it next.

Regards
Dong Aisheng


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